Time-computer.



H. H. ALLISON. TIME'COMPUTER.

APPLICATION FILED AUGJ |915.

Patented Auw.' 21,' 1917.'

Femmm. APR. MAY JUNE DATE JULY 'Aue SEPI Qc'r. Nov. oec. -u

JAN.

- certain chosen date.

TED STATES rATJilSTT'0,11FICEI HENRY rr.l ALLIsoN, orv sec` crrr,l Iowa.

, TIME-COMPUTER.

To all whom t may concern.' .y

Be it known that I, HENRY I-I.l ALLIsoN, a citizen of the United lStates, residing at Sac City, in the county ofSac and- State-'of Iowa, have invented certain new and useful Improvements in Time-Computers, lof which. the following is a specification.

My invention relatesto time'computing devices, and has for its object to provide a device for indicating the numberV ofdays from one date to another or for determining the date a specified number of'days from a read on a rotatable cylinder, and lbya single addition or subtraction Athe desired results can be obtained. The computations canabe extended into a number-of years with equal facility.

A `device of such a character would be especially beneficialin banks,- real .estate 4ofiices, lawyers offices, etc., where the fore-J named computations would beV requisite in determining interest-over aperiod of time, and generally in keepingvcount of the dates of expiration and the like. y

The full objects and advantages of my`invention will appear in connection `with the detailed description thereofv and ticularly pointed out in the claim.

In the drawings, illustrating the applica tion of my invention in one form,-

Figure 1 isla yfront elevational view computing device. Fig.2 is a-sectional eleva# tional view of my device vtaken on line 22 of Fig. 1. Fig. 3 is a developed'view of a portion of the surface lof the cylinder bearing the computing numerals. lFig. 4 is a front elevational view of a modification of a portion of the-device shown in Fig. 1';

The outer casing of my4 invention coms prises a base 10, circular heads 11 and an enveloping member 12. A drum or cylinder 13 carries a paper card 14 wound around its surface and is rigidlysecured on a shaft 15 journaled in the heads 11 and terminating are parin knobs 16 used for revolving said drum.

A circular disk 17, having thirty-one indentations 18 equally spacedin its edge, is secured to shaft 15 between one end of drum 13 and the corresponding head 11, where a detent 19 engages with the indentations 18 on' disk 17 to cause said drum to take a precise position when the rotation of said drum is stopped so as to place any of said indentations 18 in close proximity with the de-` l tent 19. The construction of said detent Certain numerals are 0f my.

specification of Letters raient. Patented Aug.l 21, 1917. Applicationled'August 7, 1915. Serial No. 44,1661

and indentations permits ofrotation of drum 13. in either direction, as becomes evident from Fig. 2., The card'14 is covered with apluralityof numerals 20v which" constitute the computing element of the device, and :will be presently eXplained,'and rows of said numerals are visible `throughlongitudi-v nal slot.21 in casing member 12 covered'by a transparent sheet 22 held in place by a clamp 23, as clearly shown in Figs. 1 and 2.l

As :the drum. 13 is 4rotated in either direction different rows of numeralsare exposed narrow strip ofpaper 24 divided into thir-v teen parts. The -c enter part has inscribed on it the wordffDate, the first siX partshave inscribed on them the first siX months of'. the year; and the last siX parts have the last six months of the; year. y The paper card 14 is continuous and is dividedinto thirty-one longitudinal rows 25,

All .the other spaces, with a few exceptions,A

offnum'erals 27 andare filledi withtwo sets 28,'and each set of numerals on one ylongitudinal row pertains to the respective months belowfwhichthey are located and tol therespectivedate visible `in the central row 25,. Theuppernumerals 27l are preferably printed in red and indicate the number of days -remaining `in that year.y rfrom and. in,

.fcluding the date specified, and the lower numerals 28 are preferably printed in black and indicate the number of days passed of the yearup to the date specified, the two numerals in any space of course adding up to three hundred and sixty-five, the number of days in the year. In the case of the months not having thirty-one days, blanks Y arev left for the missing days, as indicated at 40 in Fig. 3. v l

'In-manipulating the device the procedure vis as follows: To find the number of days and thirteen circumferential rows26 to correspond to and come opposite'the wordson the strips24. Thev between two dates in the same year, revolve i the drum 13 until the right dates appear, using either the black numerals 28 or rednumerals 27, and substract the lesser from the greater. Suppose the number of Vdays be,

tween March 30th and November 30th of the same year are desired. The red numerals are 277 and 32 and the black numerals are 88 and 333, the subtraction of either giving two hundred and forty-five days. If the computation were to be made from November 30th of one year to March 30th of the next year, the red numeral 22 corresponding to November 30th would be added to the black numeral 88 corresponding to March 30th, giving one hundred and ten days. The reverse, or finding the date a specified number of days from a given date, is procured by adding the number of days to the black numerals for future dates and subtracting them for past dates, or vice versa, to the red numerals, and then revolving the drum 13 until the sum or difference, as the case may be, appears, readingthe date directly from the corresponding day and month, bearing in mind that the number used must be of the same color as the number started with. When the sum exceeds three hundred and sixty-five, that number must be subtracted, indicating that the date extends into another year, and when the subtraction cannot be made three hundred and sixty-ve must be added to the minuend, indicating that the date extends into another year, the futurity or posteriority depending upon the use of the red or black numerals.

When a given date is often referred to, as a present date, it is of special value to have the numerals relating to that date constantly visible. To this end I provide six smaller drums 29 marked with a single circumferential row from l to 0, inclusive, three of said rows being inred and three in blaclgsaid drums being attached to small pinions 30 rotating on a shaft 31 fastened to an inclosiig case 32 on the front of member l2, said pinions 31 meshing with gears 33 extending through said case 32 and pivoted on a shaft 34 also fastened to said case 32. The case 32 is provided with a window at 35 large enough so that only Copies of this patent may be obtained for five cents one numeral on each of said drums 29 is visible. The gears 33 are rotated by hand, and by this means desired numbers are made to show through thek window 32. A modication of this portion of my invention is shown in Fig. 4. A plurality of numbered pegs 36 are stored on an extension 37 of base l0 in holes 38, and may be placed in six holes in the front of casing 12 at 39 to indicate the desired numbers.

The advantages of my invention are manifest. The device is simple to construct and operate and the computations made are accurate. It is small enough so that it can easily be moved about, and may take the place of a calendar, if the six reference numbers are each day changed.

I claim: l

A device for indicatingtime spaces between dates of the year comprising a casing provided with a transverse slot and a heading strip bearing the symbols of the months of the year and the word Date centrally of said symbols positioned above saidy slot, a cylinder within the casing having its outside exposed to said slot, there being on said cylinder a multiplicity of circumferential lines of figures, the central lineof figures falling below vthe word Date and comprising the successive numerals from one to thirty-one for the days of the month, the other circumferential lines of figures falling below the month symbols and having in each case two figures in parallel alinement with a singledate figure representing the days elapsed from the beginning of the year and the days remaining to the end of the year, and means for rotating the cylinder to expose the sets of gures for any month day through the slot.

In testimony whereof l afix my signature in presence of two witnesses. f

HENRY ALLISON.

Witnesses:

H. A. BowMAN, ALEX LAGAARD.

each, by addressing the Commissioner of Patents,

Washington, ID. C. 

